Auto ISO with D3S and SB-800

Started Jan 18, 2010 | Discussions thread
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pgphoto_ca
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Auto ISO with D3S and SB-800
Jan 18, 2010

Just for fun, i am trying the AutoIso with the flash.

I set my AutoIso to: 1/125 sec min and Maximum sentitivity to 3200 ISO and the minimum to 200 ISO.

I set my Flash to TTL- FP and let's said the camera to the Apertue Priority (or any mode will do the same).

What i found, is the AutoIso work from 200 to 800 ISO, but stop at 800 ISO maximum, even if the max is 3200 ISO.

If I set the minimum to 400 ISO...the max become 1600 ISO.

It look like a max of 2 stop difference max (in TTL mode)....hummmm

Any idea why ???

Thank you!
Pierre

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